Replied by Ted (Bangkok, Thailand)
No special brand is needed, as long as it is apple cider vinegar. The components of apple cider vinegar that helps the most is the malate and acetate portion, which will exist easier, if baking soda is added. Some people think mother formula is good, some think it is not because they have allergies. So therefore, most brands would work, but companies who sell them would like you otherwise.
